Peel 15 potatoes (less depending on the baking dish), then divide the broccoli into florets. Boil the potatoes and broccoli in a saucepan of water until the potatoes are cooked through.
In the meantime, prepare the sauce. To do this, whisk together the low-fat quark, eggs and 500 ml in a bowl. Season to taste.
Cut the mozzarella into strips and line a baking dish with them. Drain the potatoes and broccoli and place in the baking dish. Pour the sauce over it and sprinkle with the grated cheese. Baked at 180 ° C (top / bottom heat) until golden brown.